Grundfos Alpha 2 15-60 130 Setting?

[Johntheo5]

I have the Wilo Yonos Pico 25/1-6, don't think you will have any problem with the gate valves as the 25mm refers to the pump port diameter, I just used the same gate valves from my trusty 26 year old Salmson, no problems.
Mine is over4 years old and a very nice quiet pump with all those fantastic CP and PP settings which is why I bought it for ~ £100, how much is it over there now?.

The OD of the 25mm port pump (and I would think, the Wilo) is 47mm if thats any use to you.

 

[woodpeckerx]

how much is it over there now?

Around £110-120 inc VAT retail price.

I thought the 25/1-6 had a 1.5 inch thread and my Alpha 2 a 1 inch thread?

 

[Johntheo5]

Probably right, the Wilo I think is 1.5" BSP, 47.8mm OD. 1" BSP is 33.25mm OD and 1.25" BSP is 41.91mm OD. so you will need new valves if you purchase the Wilo.

 

[woodpeckerx]

The Grundfos manual says G on this digram is 1 1/2 so I'm confused now, maybe thay are both 1 1/2?

 

[Johntheo5]

What is dimension H1? if its 23.9MM, 0.94", then its 1.5" BSP.

 

[woodpeckerx]

It was the Wilo site that listed the Grundfos has having a 1 inch G1, I think its wrong

 

[woodpeckerx]

What is dimension H1? if its 23.9MM, 0.94", then its 1.5" BSP.

H1 is 27mm

 

[woodpeckerx]

 

[Johntheo5]

Bring the old pump with you, I think you will be OK though.

 

[Johntheo5]

Have you got a Wilo on the premises yet??.

 

[woodpeckerx]

Have you got a Wilo on the premises yet??.

Just outside Screwfix, will report back later.

 

[woodpeckerx]

It's fitted!! Added another bottle of Fernox F3 for good measure. Seeing some better flow but the ABV seems to be open.

Old pump had a lot of deposit around the inlet, checked the impeller with a camera and it wasn't clogged up. Pipe and elbow above the pump also had a fair amount of crud so cleaned it all out and replaced the input gate fitting.

Flow seems to be improving all the time, need to sort out why the ABV is now open, its wound right in as well.

Some inital numbers from CH only

 

[Johntheo5]

Fantastic, , definitely on the right track now, cleaning out the crap probably had a big effect.

That Wilo displays the flow I think which is very handy? Does it display the running head as well?.

Did you have to replace the pump isolation valves?

I would definitely renew the ABV but not with a Tower.

 

[woodpeckerx]

Does it display the running head as well

I don't think so, just the setting head then it reverts to power and m3/h

Did you have to replace the pump isolation valves?

Just the top one which looked ancient, the bottom one was much newer and cleaner.

I would definitely renew the ABV but not with a Tower.

I've only just fitted this tower one, are they no good?

 

[Johntheo5]

I wouldn't go so far as to say they are no good but have seen very poor posts re their TRVs, if you have replaced it again with another Tower and it works, then fine.

Are the readings above taken with all 15 rads "on" with the TRV heads removed?.